The correct answer is: 2) the light-dependent reactions produce ATP and NADPH, which are then used by the light-independent reactions
The light-dependent reaction is one of the two successive phases that occur during photosynthesis (other is light-independent reactions). The light-dependent reactions use sunlight energy to make the energy storage molecule ATP and the reduced electron carrier NADPH. In the light-independent reactions (also called Calvin cycle), CO2 is absorbed and fixed in order to build three-carbon sugars (glyceraldehyde-3-phosphate) and this process is fueled by ATP and NADPH from the light reactions.
